529ed12752
Instead of having individual PHY drivers set the SUPPORTED_Pause and
SUPPORTED_Asym_Pause flags, phylib itself should set those flags,
unless there is a hardware erratum or other special case. During
autonegotiation, the PHYs will determine whether to enable pause
frame support.
Pause frames are a feature that is supported by the MAC. It is the MAC
that generates the frames and that processes them. The PHY can only be
configured to allow them to pass through.
This commit also effectively reverts the recently applied c7a61319
("net: phy: dp83848: Support ethernet pause frames").
So the new process is:
1) Unless the PHY driver overrides it, phylib sets the SUPPORTED_Pause
and SUPPORTED_AsymPause bits in phydev->supported. This indicates that
the PHY supports pause frames.
2) The MAC driver checks phydev->supported before it calls phy_start().
If (SUPPORTED_Pause | SUPPORTED_AsymPause) is set, then the MAC driver
sets those bits in phydev->advertising, if it wants to enable pause
frame support.
3) When the link state changes, the MAC driver checks phydev->pause and
phydev->asym_pause, If the bits are set, then it enables the corresponding
features in the MAC. The algorithm is:
if (phydev->pause)
The MAC should be programmed to receive and honor
pause frames it receives, i.e. enable receive flow control.
if (phydev->pause != phydev->asym_pause)
The MAC should be programmed to transmit pause
frames when needed, i.e. enable transmit flow control.
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
316 lines
7.6 KiB
C
316 lines
7.6 KiB
C
/*
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* drivers/net/phy/smsc.c
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*
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* Driver for SMSC PHYs
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*
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* Author: Herbert Valerio Riedel
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*
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* Copyright (c) 2006 Herbert Valerio Riedel <hvr@gnu.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Support added for SMSC LAN8187 and LAN8700 by steve.glendinning@shawell.net
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mii.h>
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#include <linux/ethtool.h>
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#include <linux/phy.h>
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#include <linux/netdevice.h>
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#include <linux/smscphy.h>
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struct smsc_phy_priv {
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bool energy_enable;
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};
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static int smsc_phy_config_intr(struct phy_device *phydev)
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{
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int rc = phy_write (phydev, MII_LAN83C185_IM,
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((PHY_INTERRUPT_ENABLED == phydev->interrupts)
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? MII_LAN83C185_ISF_INT_PHYLIB_EVENTS
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: 0));
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return rc < 0 ? rc : 0;
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}
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static int smsc_phy_ack_interrupt(struct phy_device *phydev)
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{
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int rc = phy_read (phydev, MII_LAN83C185_ISF);
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return rc < 0 ? rc : 0;
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}
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static int smsc_phy_config_init(struct phy_device *phydev)
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{
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struct smsc_phy_priv *priv = phydev->priv;
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int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
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if (rc < 0)
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return rc;
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if (priv->energy_enable) {
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/* Enable energy detect mode for this SMSC Transceivers */
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rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
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rc | MII_LAN83C185_EDPWRDOWN);
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if (rc < 0)
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return rc;
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}
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return smsc_phy_ack_interrupt(phydev);
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}
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static int smsc_phy_reset(struct phy_device *phydev)
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{
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int rc = phy_read(phydev, MII_LAN83C185_SPECIAL_MODES);
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if (rc < 0)
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return rc;
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/* If the SMSC PHY is in power down mode, then set it
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* in all capable mode before using it.
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*/
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if ((rc & MII_LAN83C185_MODE_MASK) == MII_LAN83C185_MODE_POWERDOWN) {
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/* set "all capable" mode */
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rc |= MII_LAN83C185_MODE_ALL;
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phy_write(phydev, MII_LAN83C185_SPECIAL_MODES, rc);
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}
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/* reset the phy */
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return genphy_soft_reset(phydev);
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}
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static int lan911x_config_init(struct phy_device *phydev)
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{
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return smsc_phy_ack_interrupt(phydev);
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}
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/*
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* The LAN87xx suffers from rare absence of the ENERGYON-bit when Ethernet cable
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* plugs in while LAN87xx is in Energy Detect Power-Down mode. This leads to
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* unstable detection of plugging in Ethernet cable.
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* This workaround disables Energy Detect Power-Down mode and waiting for
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* response on link pulses to detect presence of plugged Ethernet cable.
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* The Energy Detect Power-Down mode is enabled again in the end of procedure to
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* save approximately 220 mW of power if cable is unplugged.
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*/
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static int lan87xx_read_status(struct phy_device *phydev)
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{
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struct smsc_phy_priv *priv = phydev->priv;
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int err = genphy_read_status(phydev);
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if (!phydev->link && priv->energy_enable) {
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int i;
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/* Disable EDPD to wake up PHY */
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int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
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if (rc < 0)
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return rc;
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rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
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rc & ~MII_LAN83C185_EDPWRDOWN);
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if (rc < 0)
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return rc;
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/* Wait max 640 ms to detect energy */
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for (i = 0; i < 64; i++) {
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/* Sleep to allow link test pulses to be sent */
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msleep(10);
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rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
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if (rc < 0)
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return rc;
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if (rc & MII_LAN83C185_ENERGYON)
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break;
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}
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/* Re-enable EDPD */
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rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
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if (rc < 0)
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return rc;
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rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
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rc | MII_LAN83C185_EDPWRDOWN);
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if (rc < 0)
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return rc;
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}
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return err;
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}
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static int smsc_phy_probe(struct phy_device *phydev)
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{
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struct device *dev = &phydev->mdio.dev;
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struct device_node *of_node = dev->of_node;
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struct smsc_phy_priv *priv;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->energy_enable = true;
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if (of_property_read_bool(of_node, "smsc,disable-energy-detect"))
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priv->energy_enable = false;
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phydev->priv = priv;
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return 0;
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}
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static struct phy_driver smsc_phy_driver[] = {
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{
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.phy_id = 0x0007c0a0, /* OUI=0x00800f, Model#=0x0a */
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.phy_id_mask = 0xfffffff0,
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.name = "SMSC LAN83C185",
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.features = PHY_BASIC_FEATURES,
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.flags = PHY_HAS_INTERRUPT | PHY_HAS_MAGICANEG,
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.probe = smsc_phy_probe,
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/* basic functions */
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.config_aneg = genphy_config_aneg,
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.read_status = genphy_read_status,
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.config_init = smsc_phy_config_init,
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.soft_reset = smsc_phy_reset,
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/* IRQ related */
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.ack_interrupt = smsc_phy_ack_interrupt,
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.config_intr = smsc_phy_config_intr,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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}, {
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.phy_id = 0x0007c0b0, /* OUI=0x00800f, Model#=0x0b */
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.phy_id_mask = 0xfffffff0,
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.name = "SMSC LAN8187",
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.features = PHY_BASIC_FEATURES,
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.flags = PHY_HAS_INTERRUPT | PHY_HAS_MAGICANEG,
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.probe = smsc_phy_probe,
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/* basic functions */
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.config_aneg = genphy_config_aneg,
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.read_status = genphy_read_status,
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.config_init = smsc_phy_config_init,
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.soft_reset = smsc_phy_reset,
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/* IRQ related */
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.ack_interrupt = smsc_phy_ack_interrupt,
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.config_intr = smsc_phy_config_intr,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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}, {
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.phy_id = 0x0007c0c0, /* OUI=0x00800f, Model#=0x0c */
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.phy_id_mask = 0xfffffff0,
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.name = "SMSC LAN8700",
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.features = PHY_BASIC_FEATURES,
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.flags = PHY_HAS_INTERRUPT | PHY_HAS_MAGICANEG,
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.probe = smsc_phy_probe,
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/* basic functions */
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.config_aneg = genphy_config_aneg,
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.read_status = lan87xx_read_status,
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.config_init = smsc_phy_config_init,
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.soft_reset = smsc_phy_reset,
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/* IRQ related */
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.ack_interrupt = smsc_phy_ack_interrupt,
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.config_intr = smsc_phy_config_intr,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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}, {
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.phy_id = 0x0007c0d0, /* OUI=0x00800f, Model#=0x0d */
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.phy_id_mask = 0xfffffff0,
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.name = "SMSC LAN911x Internal PHY",
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.features = PHY_BASIC_FEATURES,
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.flags = PHY_HAS_INTERRUPT | PHY_HAS_MAGICANEG,
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.probe = smsc_phy_probe,
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/* basic functions */
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.config_aneg = genphy_config_aneg,
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.read_status = genphy_read_status,
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.config_init = lan911x_config_init,
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/* IRQ related */
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.ack_interrupt = smsc_phy_ack_interrupt,
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.config_intr = smsc_phy_config_intr,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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}, {
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.phy_id = 0x0007c0f0, /* OUI=0x00800f, Model#=0x0f */
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.phy_id_mask = 0xfffffff0,
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.name = "SMSC LAN8710/LAN8720",
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.features = PHY_BASIC_FEATURES,
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.flags = PHY_HAS_INTERRUPT | PHY_HAS_MAGICANEG,
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.probe = smsc_phy_probe,
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/* basic functions */
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.config_aneg = genphy_config_aneg,
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.read_status = lan87xx_read_status,
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.config_init = smsc_phy_config_init,
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.soft_reset = smsc_phy_reset,
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/* IRQ related */
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.ack_interrupt = smsc_phy_ack_interrupt,
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.config_intr = smsc_phy_config_intr,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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}, {
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.phy_id = 0x0007c110,
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.phy_id_mask = 0xfffffff0,
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.name = "SMSC LAN8740",
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.features = PHY_BASIC_FEATURES,
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.flags = PHY_HAS_INTERRUPT | PHY_HAS_MAGICANEG,
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.probe = smsc_phy_probe,
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/* basic functions */
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.config_aneg = genphy_config_aneg,
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.read_status = lan87xx_read_status,
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.config_init = smsc_phy_config_init,
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.soft_reset = smsc_phy_reset,
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/* IRQ related */
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.ack_interrupt = smsc_phy_ack_interrupt,
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.config_intr = smsc_phy_config_intr,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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} };
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module_phy_driver(smsc_phy_driver);
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MODULE_DESCRIPTION("SMSC PHY driver");
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MODULE_AUTHOR("Herbert Valerio Riedel");
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MODULE_LICENSE("GPL");
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static struct mdio_device_id __maybe_unused smsc_tbl[] = {
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{ 0x0007c0a0, 0xfffffff0 },
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{ 0x0007c0b0, 0xfffffff0 },
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{ 0x0007c0c0, 0xfffffff0 },
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{ 0x0007c0d0, 0xfffffff0 },
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{ 0x0007c0f0, 0xfffffff0 },
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{ 0x0007c110, 0xfffffff0 },
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{ }
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};
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MODULE_DEVICE_TABLE(mdio, smsc_tbl);
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